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We provide a full range from simple stack height calculations to air dispersion modelling using ADMS 5.2

Industrial facilities, often those with environmental permits, can have a significant impact on local air quality and an assessment of air emissions is often required. We liaise with regulators across the U.K. (e.g. SEPA, Environment Agency, NIEA and local councils) for such assessments and know what is required to satisfy their requirements. This can be undertaken for any pollutant, including odour, and used to define an appropriate stack height if required.

Where possible we will look to avoid a detailed assessment by using cost-effective techniques such as D1 calculations or the Environment Agency’s  H1 Software Tool.

Where detailed assessment is required, we will use the most appropriate dispersion modelling software (e.g. ADMS 5.2) to undertake a more robust assessment.

If the predicted air quality impact is too large we will work with you to define a practical, cost-effective improvement strategy, from process modification to abatement plant design and installation. We can also assist in the preparation of suitable management systems e.g. odour management plans.

What is an air pollution dispersion model?

A dispersion model is a computer simulation used to model the air quality impact of existing and proposed industrial installations.

It typically includes the following parameters

  • Stack location
  • Stack height
  • Pollutant emission rate
  • Stack Exit diameter
  • Stack Exit temperature
  • Efflux velocity
  • Volumetric flow rate

You must also include other relevant data, including:

  • temperature
  • oxygen and moisture levels
  • emissions that vary with time
  • weather data and surface characteristics
  • terrain and building treatments

What is a Gaussian dispersion model?

Gaussian plume air dispersion models require that the atmospheric boundary layer properties are characterised by two parameters (the boundary layer depth and the Monin-Obukhov length) rather than in terms of the single parameter Pasquill-Gifford class. Dispersion under convective meteorological conditions uses a skewed Gaussian concentration distribution (shown by validation studies to be a better representation than a symmetrical Gaussian expression).

Air Quality Assessment - Related Services

To find out more about how Mabbett can work with you, please get in touch.

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